At ordinary temperatures, the electrical conductivity of semi conductors in  mho/meter is in the range 
(a)10-3 to 10-4             (b)106 to 109
(c) 10-6 to  10-10          (d) 10-10 to 10-16

Concept Questions :-

Types of semiconductors
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 In a P-type semiconductor, germanium is doped with

(a) Boron                     (b) Gallium
(c) Aluminium              (d) All of these

Concept Questions :-

Types of semiconductors
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GaAs is 

(a) Element semiconductor

(b) Alloy semiconductor

(c) Bad conductor

(d) Metallic semiconductor

Concept Questions :-

Types of semiconductors
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If ne and nh are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then

(a) ne>> nh                (b)  ne<< nh  
(c) nenh                  (d) ne = nh  

Concept Questions :-

Types of semiconductors
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To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is 
(a) Monovalent          (b) Divalent
(c) Trivalent               (d) Pentavalent

Concept Questions :-

Types of semiconductors
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For germanium crystal, the forbidden energy gap in joules is

(a) 1.12×10-19         (b) 1.76×10-19
(c)  1.6×10-19          (d) Zero

Concept Questions :-

Energy band theory
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A pure semiconductor behaves slightly as a conductor at

(a) Room temperature             (b) Low temperature
(c) High temperature               (d) Both (b) and (c)

Concept Questions :-

Types of semiconductors
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Which is the correct relation for the forbidden energy gap in the conductor, semiconductor, and insulator

(a) Egc<Eginsulator<Egsc
(b) Egc<Egsc<Eginsulator
(c) Egsc<Eginsulator<Egc
(d) Egsc<Ec<Eginsulator

Concept Questions :-

Energy band theory
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At room temperature, a P-type semiconductor has

(a) Large number of holes and few electrons
(b) Large number of free electrons and few holes
(c) Equal number of free electrons and holes
(d) No electrons or holes

Concept Questions :-

Types of semiconductors
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The energy band gap is maximum in

(a) Metals               (b) Superconductors
(c) Insulators          (d) Semiconductors

Concept Questions :-

Energy band theory
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